Auto discovery of new sites

I know there is a web site called [BTDigg](https://en.wikipedia.org/wiki/BTDigg) that is a search engine based on data from DHT. I wonder if a similar search engine could be devised for ZeroNet. I know there is a namecoin directory, but it seems limited to namecoin domains only. There must be sites that exist we are not finding yet that exist on the DHT network.

No source file, entry point, or test is named. Start by reviewing ZeroNet's current site discovery behavior and the existing Namecoin directory, then define the scope for DHT-based discovery; done would require an agreed design and implementation plan.

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